›› 2009, Vol. 30 ›› Issue (4): 976-980.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on instability of slope composed of two strain-softening media

SUN Qiang，HU Xiu-hong，WANG Yuan-yuan，LI Man   

  1. Key Laboratory of Engineering Geomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
  • Received:2008-06-23 Online:2009-04-10 Published:2011-01-30

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Abstract:

The instability of slope which consists of two strain-softening media is analyzed. The sliding surface is assumed to be planar. There are two factors, which are water and strain, for considering damage soften of the media. The shear stress-strain constitutive relation ship is described by the index distribution law. In this way, a cusp catastrophe model of slope system is established. Through the analytical result, it is discovered that the slope stability has close relation with the stiffness ratio k of medium 2 to medium 1, and the water content of sliding surface medium. Under some specific condition, it finds that with the increase of water content, which results in the change of stiffness ratio k, especially under the condition of rainfall, the landslide is easy to lose its stability.

Key words: cusp catastrophe, instability, stiffness radio, water-induced softening

CLC Number: 

  • TU 753.8
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